# Query latency increase when upgrading from 7.10.2

**URL:** <https://discuss.elastic.co/t/query-latency-increase-when-upgrading-from-7-10-2/280585>\
**Category:** Elasticsearch\
**Created:** [August 5, 2021, 7:02pm UTC](https://discuss.elastic.co/t/query-latency-increase-when-upgrading-from-7-10-2/280585 "2021-08-05T19:02:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![BS1](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/bs1/32/1718_2.png) [@BS1](https://discuss.elastic.co/u/BS1)\
**Post date:** [August 5, 2021, 7:02pm UTC](https://discuss.elastic.co/t/query-latency-increase-when-upgrading-from-7-10-2/280585/1 "2021-08-05T19:02:21Z")

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We have been running Elasticsearch 7.10.2 for a while in a production setting now, serving thousands of requests per second across 10 separate clusters. Our clusters are all in AWS on ec2 hosts. A coupe of months back we upgraded from 7.10.2 to 7.12.1 and noticed that the data node query latency (as measured by the datadog integration using metrics `elasticsearch.search.query.time` divided by `elasticsearch.search.query.total`) increased significantly -- from ~ 7ms to ~ 13ms. That's a 90% increase. Not understanding what was going on, we moved back to 7.10.2.

The hardware is unchanged between version upgrades. Our data nodes are of ec2 instance type i3.8xlarge with 4 locally attached 1.8TB NVMe devices. Each node is running 4 ES instances with 28GB heap. We are using the JVM that comes embedded with the official Elasticsearch debian package.

Yesterday we built a new cluster using 7.13.4 and replayed traffic to it to compare. Same observations: Query latencies almost double that of 7.10.2.

I've combed through changelogs to find anything that could explain this behavior but cannot. Has anyone else seen the same ?

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 2, 2021, 7:02pm UTC](https://discuss.elastic.co/t/query-latency-increase-when-upgrading-from-7-10-2/280585/2 "2021-09-02T19:02:25Z")

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